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Equity - Additional Information (Details)
Aug. 07, 2013
$ / shares
shares
Feb. 26, 2016
$ / shares
Dec. 31, 2015
$ / shares
Dec. 31, 2014
$ / shares
Schedule of Equity Method Investments [Line Items]        
Common stock, par value per share $ 0.50   $ 0.50 $ 0.50
Ratio of common stock to warrant 0.14771      
Warrant        
Schedule of Equity Method Investments [Line Items]        
Number of securities called by warrants | shares 1      
Exercise price $ 40.00      
Aggregate number of warrants | shares 3,000,000      
Warrant | Subsequent Event        
Schedule of Equity Method Investments [Line Items]        
Market value of warrants (less than)   $ 0.01